Kinetic simulations of x‐line expansion in 3D reconnection

Lapenta, Giovanni; Krauss‐Varban, D.; Karimabadi, H.; Huba, J. D.; Rudakov, L. I.; Ricci, Paolo

doi:10.1029/2005gl025124

Cited by 51 publications

(62 citation statements)

References 20 publications

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“…While the pressure tensor-based thermal dissipation persists, it supplies only approximately half of the force-balance if the plasma is relativistic enough. This is a deviation from nonrelativistic results, 2,[8][9][10] which show a strong dominance of the thermal dissipation mechanism.…”

Section: Discussioncontrasting

confidence: 71%

“…2 Although some questions remain in turbulent plasmas, most recent investigations have found that, in the central magnetic reconnection region, the relevant additional term is provided by the thermal inertia. [2][3][4][5][6][7][8][9][10] The physics behind this is associated with the transient nature of particle orbits in the reconnection region. Pre-acceleration particles are continuously transported into the reconnection region, whereas accelerated particles tend to leave.…”

Section: Introductionmentioning

confidence: 99%

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Dissipation in relativistic pair-plasma reconnection

Hesse

Zenitani

2007

Physics of Plasmas

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An investigation into the relativistic dissipation in magnetic reconnection is presented. The investigated system consists of an electron-positron plasma. A relativistic generalization of Ohm's law is derived. A set of numerical simulations is analyzed, composed of runs with and without guide magnetic field, and of runs with different species temperatures. The calculations indicate that the thermal inertia-based dissipation process survives in relativistic plasmas. For antiparallel reconnection, it is found that the pressure tensor divergence remains the sole contributor to the reconnection electric field, whereas relativistic guide field reconnection exhibits a similarly important role of the bulk inertia terms.

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Section: Discussioncontrasting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Dissipation in relativistic pair-plasma reconnection

Hesse

Zenitani

2007

Physics of Plasmas

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“…This scenario is supported by a number of kinetic models, [9][10][11][12]15 but others also show turbulence in the inner reconnection region. [16][17][18] Limitations of this theory may also be found in relativistic plasmas, or for very strong guide fields, where the Larmor radius becomes comparable to the Debye scale. Therefore, the generality of the thermal inertia-based process is still to be determined, but it seems likely that it will apply in a large variety of situations.…”

Section: Discussionmentioning

confidence: 99%

Dissipation in magnetic reconnection with a guide magnetic field

Hesse

2006

Physics of Plasmas

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A combination of numerical simulation results and analytical theory is applied to the problem of magnetic reconnection in a guide magnetic field. An investigation of electron distribution functions within the electron diffusion region leads to a picture of mixing of particles with different acceleration histories on electron Larmor scales. Based on an apparent average loss of accelerated particles by field-aligned and E ϫ B transport, it is proposed that the role of the reconnection electric field is to replenish this loss by acceleration of particles that enter the electron diffusion region. Analytic theory is employed to verify this model, and an equation is derived, which balances the average electric field force density by a diffusion term applied to the electron momentum density. The diffusion coefficient contains explicitly the electron Larmor spatial scale and a poloidal transport time scale.

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“…This region has been observed extensively at the ion-scale [3][4][5][6][7][8][9], but little is know at electron skin depth (λ e ) scales. This region also has been examined extensively with numerical simulations and analytic analysis [10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Magnetospheric Multiscale Satellites Observations of Parallel Electric Fields Associated with Magnetic Reconnection

Ergun¹,

Goodrich²,

Wilder³

et al. 2016

Phys. Rev. Lett.

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We report observations from the Magnetospheric Multiscale (MMS) satellites of parallel electric fields (E || ) associated with magnetic reconnection in the sub-solar region of Earth's magnetopause. E || events near the electron diffusion region have amplitudes on the order of 100 mV/m, which are significantly larger than predicted for an anti-parallel reconnection electric field. This article addresses a specific type of E || events, which appear as large-amplitude, near unipolar spikes that are associated with tangled, reconnected magnetic fields. These E || events are primarily in or near a current layer near the separatrix and are interpreted to be double layers that may be responsible for secondary reconnection in tangled magnetic fields or flux ropes. These results are telling of the 3D nature of magnetopause reconnection and indicate that magnetopause reconnection may be often patchy and/or drive turbulence along the separatrix that results in flux ropes and/or tangled magnetic fields. 2

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Kinetic simulations of x‐line expansion in 3D reconnection

Cited by 51 publications

References 20 publications

Dissipation in relativistic pair-plasma reconnection

Dissipation in relativistic pair-plasma reconnection

Dissipation in magnetic reconnection with a guide magnetic field

Magnetospheric Multiscale Satellites Observations of Parallel Electric Fields Associated with Magnetic Reconnection

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